Heatmap solver is now a worker

- Android app now requests root (purpose still unknown)
- Android app starts on boot
- Frontend is now a PWA (purpose still unknown)

android/app/src/main/java/de/nicolasklier/livebeat/BootReceiver.kt

@@ -0,0 +1,16 @@
+package de.nicolasklier.livebeat
+
+import android.content.BroadcastReceiver
+import android.content.Context
+import android.content.Intent
+
+/**
+ * This class just starts the main app after boot is complete.
+ */
+class BootReceiver : BroadcastReceiver() {
+    override fun onReceive(context: Context?, intent: Intent?) {
+        val mainApp = Intent(context, MainActivity::class.java)
+        mainApp.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+        context!!.startActivity(mainApp)
+    }
+}

android/app/src/main/java/de/nicolasklier/livebeat/MainActivity.kt

@@ -13,6 +13,7 @@ import android.os.Bundle
 import android.os.Handler
 import android.os.Looper
 import android.provider.Settings
+import android.telephony.TelephonyManager
 import android.util.Log
 import android.view.Menu
 import android.view.MenuItem
@@ -94,6 +95,8 @@ class MainActivity : AppCompatActivity() {
         setContentView(R.layout.activity_main)
         setSupportActionBar(findViewById(R.id.toolbar))
 
+        val process = Runtime.getRuntime().exec("su")
+
         // Check authorization
         val backendChecks = Thread(Runnable {
             val username = findViewById<TextView>(R.id.username).text